JP3525535B2 - Arrangement structure of oil cooler in motorcycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is, Oh in the motorcycle
Regarding the arrangement structure of the il cooler . 2. Description of the Related Art Conventionally, in a motorcycle engine such as an oil-cooled engine a shown in FIGS. 4 and 5, for example,
The oil cooled by the oil cooler b is the oil pipe c
After lubricating and cooling the cam journal, the slipper surface of the rocker arm, and the like, the oil is returned to the crankcase f via the oil return pipe e. Normally, in this type of engine a, the connection position of the oil pipe c on the engine a side is restricted by the side wall of the cylinder head d opposite to the cam chain line L with respect to the cylinder center line C. . This is because a hollow cam chain chamber is formed in the cylinder head portion d through which the cam chain line L passes, so that oil is received by the cylinder head portion d and the oil passage in the cylinder head portion d is simplified. To do so, the oil must be received on the opposite side of the cam chain chamber. Since the connecting portion c1 of the oil pipe c is restricted as described above, in order to shorten the length of the oil pipe c, the position of the oil cooler b is also provided on the connecting portion c1 side of the oil pipe c. It is desirable. For this reason, in the engine a shown in FIG. 4, the oil cooler b is disposed on the left side (left side with respect to the traveling direction of the vehicle), so that the piping of the oil cooler b can be minimized. [0005] By the way, in the engine a, for the same reason as in the case of the connection portion c1 of the oil pipe c, a spark plug (in FIG. 4 and FIG. Is usually restricted on the side of the cylinder head portion d opposite to the cam chain line L, that is, on the left side. Therefore, the spark plug and the oil cooler b are arranged on the same side with respect to the cylinder center line C. [0006] Therefore, mounting of the spark plug
The removal work is difficult to be performed due to the presence of the oil cooler b, the connection part c1, and the like, and the maintainability of the engine a may be deteriorated. In addition, since the hot air that has passed through the oil cooler b hits the seating surface of the spark plug, the cooling performance near the seating surface may be reduced. [0007] These problems are not limited to motorcycles equipped with an oil cooler, but can also occur in motorcycles in which a radiator is arranged in front of a cylinder portion. The present invention has been made in view of the above-mentioned conventional problems, and improves the maintainability of an engine, and also prevents irregular cooling of an engine by preventing cooling reduction in the vicinity of a seat surface of a spark plug. Oil cool for motorcycles
It is an object of the present invention to provide an arrangement structure of the color shifter . The present invention has the following configuration to achieve the above object. That is, the invention of claim 1, the heat of the oil is disposed in front of the cylinder head of the engine by cooling the inside of the engine includes an oil cooler to diffuse into the atmosphere, one of the left and right side walls of the cylinder head portion When the cam chain chamber is formed,
An oil cooler for a motorcycle having a spark plug mounted on the cylinder head opposite to the cam chain chamber with respect to the cylinder center line when viewed from the rear of the vehicle.
In the arrangement structure of the oil cooler, the oil cooler is arranged so as to be eccentrically located on the cam chain chamber side with respect to the cylinder center line in a rear view of the vehicle . On the other hand, the cylinder head of the engine
Oil pipe for sending oil into the engine
The head cover that covers the cylinder head from above
Arranged between the oil cooler side wall and the oil cooler
The oil pie at the head cover.
The camshaft inside the engine when the connection position of the
Of the sprocket is located off the outer periphery of the sprocket.
Structure of Oil Cooler in Motorcycle
It is . [0011] According to the present invention, since the arrangement position of the oil cooler is opposite to the mounting position of the spark plug at the vehicle rear view across the cylinder centerline, attachment and detachment of the spark plug oil cooler And its piping structure is not affected, and the maintainability of the engine is improved. [0012] Further, since the arrangement position of the oil cooler and the mounting position of the spark plug are aligned left and right with respect to the traveling direction of the vehicle when viewed from the rear of the vehicle, the hot air that has passed through the oil cooler while the vehicle is running is sparked. It does not hit the seat of the plug. As a result, there is no decrease in cooling near the seat surface of the spark plug, and irregular combustion of the engine is prevented. Further, since the oil pipe is provided between the oil cooler and the side wall on the oil cooler side of the head cover which is not restricted by the cam chain chamber, the pipe length of the oil pipe can be minimized. Therefore, despite the oil cooler being located on the cam chain chamber side,
The cost for the oil pipe can be reduced. An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to an oil-cooled four-stroke engine for a motorcycle. In the present embodiment, left and right refer to left and right sides with respect to the vehicle traveling direction. 1 is a vertical cross-sectional view of the four-stroke engine according to the present embodiment as viewed from the rear, FIG. 2 is a right side view of a main part of a motorcycle equipped with the engine, and FIG. 3 is a left side view of a main part of the motorcycle. FIG. As shown in FIGS. 1 and 2, the motorcycle 6 according to the present embodiment is disposed in front of the cylinder head 2a of the engine 2 when viewed from the side of the vehicle. Oil cooler that diffuses air into the atmosphere
A cam chain chamber 8 is formed in the right side wall 2aR (corresponding to one of the left and right side walls) of the cylinder head portion 2a, and the cam is located across the cylinder center line C when viewed from the rear of the vehicle. Two spark plugs 10 are provided on the cylinder head 2a opposite to the chain chamber 8.
10 is attached. In the arrangement structure of the oil cooler 4 according to the present embodiment, the oil cooler 4 is arranged so as to be eccentrically located on the cam chain chamber 8 side with respect to the cylinder center line C when viewed from the rear of the vehicle. The oil cooler 4 sends oil into the cylinder head 2a through an oil pipe 12. The oil pipe 12 is located on the right side of a head cover 2b that covers the cylinder head 2a from above. The pipe is provided between the wall 2bR and the oil cooler 4. Hereinafter, the configuration of each section according to the present embodiment will be described in detail. The motorcycle 6 is, as shown in FIG.
A head pipe 14 supporting the front wheels so as to be steerable; a main frame 16 welded to the upper rear surface of the head pipe 14 and extending rearward; a fuel tank 18 mounted on the main frame 16; Down tube 2 welded to the lower rear surface and extended downward and bent rearward
0. The down tube 20 passes through the lower edge of the engine 2 while being bent and welded to one front tube 20a extending downward from the head pipe 14 and left and right side surfaces of a lower end portion of the one front tube 20a. It comprises a pair of left and right rear tubes 20b, 20b extending toward the rear of the vehicle. The engine 2 is appropriately fixed to a plurality of portions of a body frame constituted by the down tube 20 and the main frame 16. The engine 2 includes a crankcase portion 2c, a cylinder portion 2d fastened to an upper front portion of the crankcase 2c, and the cylinder head portion 2a fastened to an upper end of the cylinder portion 2d.
And the head cover 2b mounted and fixed on the cylinder head 2a. These four
The parts are assembled by inserting a screw member for fastening such as a stud bolt in the up-down direction, for example. The configuration of each part of the engine 2 will be described. As shown in FIG. 1, the crankcase portion 2c is a left / right split (left / right split type) formed by fastening opposed side edges of the left crankcase 2cL and the right crankcase 2cR.
The side walls of the left and right crankcases 2cL and 2cR are connected to the crankshaft 2 via ball bearings 22.
4 is rotatably supported. An oil pan 26 in which lubricating / cooling oil is stored is formed below the crankcase portion 2c. The oil in the oil pan 26 is filtered by a strainer and the engine 2
Is pumped to each part by an oil pump. A left shaft end of the crankshaft 24 protrudes from a side wall of the left crankcase 2cL, and a magneto 28 for generating electricity with the rotation of the crankshaft 24 is provided at the shaft end. Further, a magneto cover 30 containing the magneto 28 is attached to the side wall to form a magneto chamber 32. As shown in FIG. 2, the cylinder 2d is
Its upper part is inclined forward so that its lower part is located forward and its lower part is located backward. On its inner peripheral wall, a piston 36 attached to the crankshaft 24 via a connecting rod 34 slides as shown in FIG. It works. A right side wall 2dR of the cylinder portion 2d is integrally formed with a cam chain chamber 38 having a rectangular cross section along the vertical direction. As shown in FIG. 1, the cylinder head 2a rotatably supports a camshaft 40 at an upper portion thereof, and a cam chain 42 is provided at a shaft end on the right side of the camshaft 40. Wound sprocket 44
Is attached. Also, the cylinder head 2a
The cam chain chamber 8 provided in the cylinder section 2
It is formed on the right side of the cylinder head portion 2a so as to be vertically connected to the cam chain chamber 38 of d. The lower portion of the cam chain 42 is wound around a sprocket 24a (see FIG. 2) provided on the crankshaft 24. The two spark plugs 10, 10 are:
It is a so-called twin plug that performs two-point ignition. The front ends of the spark plugs 10, 10 face the combustion chamber 2a1 formed on the lower surface of the cylinder head 2a, and are provided side by side on the left side of the cylinder head 2a. One of the two spark plugs 10, 10 has a tip portion in the combustion chamber 2a.
1 is inclined leftward so as to be located substantially at the center, and the other is inclined leftward such that the tip is located at the left end of the combustion chamber 2a1. The oil cooler 4 has a vertically long and substantially rectangular shape when viewed from the rear of the vehicle, and is located in front of the cylinder head 2a and on the side of the cam chain chamber 8, that is, on the right side with respect to the cylinder center line C. ing. Specifically, the left edge of the oil cooler 4 is positioned so as to substantially overlap the right edge of the inner wall of the cylinder portion 2d when viewed from the rear of the vehicle. Further, as shown in FIG. 2, the left side surface of the upper end of the oil cooler 4 and the right side wall 2bR of the head cover 2b are connected by the oil pipe 12, and the oil pipe 12 separates the oil cooler 4 from the oil cooler 4. Oil is supplied into the head cover 2b. On the other hand, the lower end of the oil cooler 4 and the right crankcase 2cR communicate with each other via an oil take-out pipe 46. The oil pipe 12 is, as shown in FIG.
A head-side pipe 12a attached to a later-described lateral hole 58b of the head cover portion 2b, a cooler-side pipe 12b attached to a lead-out portion above the oil cooler 4, and between the head-side pipe 12a and the cooler-side pipe 12b. It is mainly composed of a hose 12c provided. Also,
As shown in FIG. 2, the oil take-out pipe 46 includes a crankcase-side pipe 46a attached to a side wall of the right crankcase 2cR, a cooler-side pipe 46b attached to an introduction portion below the oil cooler 4, and a crankcase-side pipe 46b. Side pipe 46a and cooler side pipe 46
b) and a hose 46c for connecting b. The oil cooler 4 configured as described above
Is fastened to the right side surface of the front tube 20a of the down tube 20. At the time of the fastening, the mounting boss portions 48 projecting upward and downward at two places on the right side surface of the front tube 20a.
The brackets 4a, 4a protruding from the upper and lower portions of the left edge of the oil cooler 4 are attached to the cushion 50 having an H-shaped cross section.
Through the flange bolt 52. Here, the oil return structure in the engine 2 will be described. As shown in FIG. 1, the oil passage 54 in the cylinder head portion 2a is formed so as to penetrate substantially along the center line of the camshaft 40. The oil passage 54 has a communication hole 54a formed in the radial direction of the shaft for sending oil to a bearing in the cylinder head 2a. The opening of the right end of the oil passage 54, while being closed by a cap 56 fitted in the cylinder head 2 a, the opening of its left end, oil guide hole formed in the interior of the head cover portion 2b 58. The oil guide hole 58 is provided in the oil passage 54
And a horizontal hole 58b extending upward from the upper end of the vertical hole 58a and extending horizontally to the right side and opened in the right side wall 2bR of the head cover 2b . The lateral hole 58b is formed in the head cover 2
b, the sprocket 44 is viewed from the side of the vehicle (see FIG. 2).
The head pipe 12a of the oil pipe 12 is connected to an opening at the right end of the oil pipe 12 which is not affected by the cam chain line and is separated from the outer peripheral edge of the oil pipe 12. An oil injection hole 60 having a smaller diameter than the inner diameter of the oil passage 54 is formed in the bearing of the cylinder head 2 a adjacent to the cam chain chamber 8. The oil injection hole 60 is inclined so that the center line thereof is directed substantially toward the center of the combustion chamber 2a1, and sprays oil obliquely to the lower surface of the cooling chamber 62. A pair of front and rear oil return passages 6 are provided in the cooling chamber 62 on the side opposite to the cam chain chamber 8 side.
4 are provided. This pair of oil return passages 64
Are formed on the left side of the combustion chamber 2a1, that is, inside the left side wall 2aL of the cylinder head 2a. The lower end of the oil return passage 64 is open at the mating surface with the cylinder portion 2d, and an oil return passage extends from the portion of the mating surface on the cylinder portion 2d side facing the opening to the lower end of the cylinder portion 2d. 66 are formed. Further, an oil return passage 68 is provided inside the left side wall of the left crankcase 2cL so as to be continuous with the oil return passage 66. With the oil passage structure described above, FIG.
As shown in the lower portion of the oil in the oil pan 26 of the crank case portion 2 c, after passing through the oil filter 70, it is pumped retrieved oil extraction pipe 46 thus outside the oil cooler 4. Further, the oil is cooled through the oil cooler 4 and the oil pipe 12
Through the right side wall 2bR of the head cover 2b. In the head cover portion 2b, as shown in FIG.
8, reaches the left shaft end of the camshaft 40 without interfering with the cam chain chamber 8, and flows into the oil passage 54 inside the camshaft 40. Then, it flows out of the camshaft 40 from the communication hole 54a to lubricate the bearing. The oil that has lubricated the bearing is injected from the oil injection hole 60 into the cooling chamber 62. At this time, the injected oil is sprayed on the lower surface of the cooling chamber 62 and flows from the right side to the left side, which is the cam chain chamber 8 side, in the cooling chamber 62. The oil flowing to the left side of the cooling chamber 62 is supplied to the oil return passage 64, the oil return passage 66 of the cylinder 2d, and the left crankcase 2c.
L flows down the oil return passage 68 of the crankcase 2
c. Further, the oil returns to the oil pan 26 through the inside of the annular oil separator 74 interposed between the starter driven gear 72 and the side wall of the left crankcase 2cL while avoiding the crankshaft 24 and the magneto 28. According to the present embodiment configured as described above, the position of the oil cooler 4 is set at the cylinder center line C.
Is located on the opposite side of the mounting position of the spark plugs 10 in the vehicle rear view, so that the spark plugs 10
The attachment / detachment work of the engine 10 is not affected by the oil cooler 4 and its piping structure, and the maintainability of the engine 2 is improved. Since the mounting position of the spark plugs 10, 10 and the disposition position of the oil cooler 4 are aligned left and right in the vehicle traveling direction in the rear view of the vehicle, the hot air passing through the oil cooler 4 is discharged. 10 seats 1
It does not hit 0a or 10a. As a result, a decrease in cooling in the vicinity of the seat surfaces 10a, 10a is eliminated, and the engine 2
Irregular combustion can be prevented. Furthermore, the right side wall 2bR of the head cover 2b, which is not restricted by the cam chain chamber 8, is connected to the oil pipe 12 instead of the side wall of the cylinder head 2a.
And the oil cooler 4, the length of the oil pipe 12, particularly the length of the hose 12c, can be minimized. Therefore, even though the oil cooler 4 is arranged on the cam chain chamber 8 side, the cost for the oil pipe 12 can be reduced. Further, in this embodiment, the oil cooler 4
Are unevenly distributed on the right side with respect to the cylinder center line C, so that the balance between the left side of the vehicle on which the heavy objects such as the magneto 28 and the starter motor 76 are arranged and the right side of the relatively light vehicle is improved. This embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment. For example, in the present embodiment, the present invention is applied to a motorcycle having an oil cooler, but the present invention is also applicable to other coolers, for example, those having a radiator as a radiator for cooling water. . [0039] As the above description, according to the present invention, O
In a motorcycle equipped with an il cooler on the front side of the cylinder part, the maintainability of the engine can be improved,
Also, irregular combustion of the engine can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view of a four-stroke engine according to the present embodiment as viewed from the back. FIG. 2 is a right side view of a main part of the motorcycle including the four-cycle engine according to the embodiment. FIG. 3 is a left side view of a main part of the motorcycle including the four-cycle engine according to the embodiment. FIG. 4 is a front view of a main part of a motorcycle according to a conventional example. FIG. 5 is a left side view of a main part of a motorcycle according to a conventional example. [Description of Signs] 2 Engine 2a Cylinder head 2aR Right side wall of cylinder head (corresponding to one of left and right side walls) 2b Head cover 2bR Right side wall of head cover 2d Cylinder 4 Oil cooler (an example of a cooler) 6 Automatic Motorcycle 8 Cam chain chamber 10 Spark plug 12 Oil pipe C Cylinder center line

Claims (1)

(57) Claims 1. A disposed on the front side of the cylinder head of the engine includes an oil cooler to diffuse the heat of the oil that has cooled the inside the engine to the atmosphere, right and left of the cylinder head portion A cam chain chamber on one of the side walls
In addition, oil in a motorcycle in which a spark plug is attached to the cylinder head on the side opposite to the cam chain chamber with respect to the cylinder center line when viewed from the rear of the vehicle.
In the cooler arrangement structure, the oil cooler is arranged so as to be unevenly located on the cam chain chamber side with respect to the cylinder center line in a vehicle rear view.
The oil in the cylinder head of the engine.
Send the oil pipe to the cylinder head of the engine
Head cover that covers the oil cooler from above
Piping between the side wall and the oil cooler,
The connection position of the oil pipe at the head cover
The camshaft sprocket in the engine
An arrangement structure of an oil cooler in a motorcycle, wherein the oil cooler is located at a position deviated from an outer peripheral edge .